Odd issue indeed. The heartbeat dll reads from the games memory to get the server name and then sends it to the NovaHQ (and cc) lobby. The lobby is updated with this "new" info every ~30 or so seconds. Novaworld.cc usually gets it's info direct from Novaworld's glb file, but because NovaWorld is down it's sending a "nova ping" request to your server just like how the pinger works. The server is indeed responding with the name ! ~1FAS RIP 4DOOR according to my own pinger.
You can see that here:
http://nw.novahq.net/nova/ping?g=dfb...80.174%3A17479
Could it possibly be the server manager software changing the name?